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How do you test for current draw in a car using a volt meter?


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2015-07-16 19:33:01
2015-07-16 19:33:01

You get a properly sized low value resistance of high accuracy like 1% known resistance say 1 ohm.

Then you place the wire that you want to measure in series with the resistor and place the voltmeter across the resistor.

So if you have a 1 ohm resistor and the meter is reading 1 volt then you have 1 amp flowing in there.

you need to unhook the negative battery cable and set your mutimeter to amps and connect it between the negetive cable and the battery and that will tell you what kind of draw you have just make sure that your multi meter is set up right

You can't measure the current drawn by a car. The current is WAY to high for most meters. Most meters will only measure up to 10Amps. The first guy has the best idea. Get a 1ohm resistor and measure the voltage across it. The voltage measured divided by the resistor value equals the current consumption.

If you have to use a voltmeter the first answer is right just make sure its a 5 or 10 watt resistor at least and don't turn the key definitely.Just measure for current being taken that shouldn't be.

And yes you can use an ammeter to measure the current make sure its on the correct range (1 amp or 10 amp is better) and don't turn the key just check for current being drawn other than the starter and relay.If you turn the key big trouble lol.Probably burn out the meter burn yourself if using a resistor or just not good :) And don't wory about a 1% resistor 5% or 10 % is fine to just get a good idea of the amount of current.

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Related Questions

Basically it tells the person doing the draw test how many amps a product is using!Which inturn tells the person doing the test if there is a problem with the items being tested.

With a meter you can only test continuity. And if you are not careful you may damage the meter. You may test the coil but additional circuits are required

You will need a test instrument known as a clamp on amp meter. The test instrument clamps around one of the A/C units feed conductors. From the meter face you will read what the actual current is flowing through the feeder conductor.

your meter must be capable of reading ac current. set it to ac(there will be more than one scale and house current is 115 volt so choose one that is sure to handle that. If you are checking an outlet, insert one probe in each slotted receptacle and read how many volts you have--if any Answer #2 Voltage and current are two different things. You can't check current with a volt meter unless it has a setting to measure current. Even then, you have to have the meter in series with the device being checked. This can be dangerous if you don't know what you are doing. Another safer option is to get a clamp meter which will measure current draw when clamped around ONE wire leading to the device in question.

Remove starter and bench test it for operation and current draw

you need to test with ohm. meter... there are resitance test. and could also be output test using a volt meter. you will need a service manuel to get sepect.....for the corrct make ,model, and year,,,,... what is your problem that your having.....

There is a test procedure for that using an ohm meter. Consult a Chilton's or similar repair manual.

using an universal indicator, or you can use litmus paper or a pH meter.

A continuity test is a simple test, used to determine whether there is a break in a circuit. This can be done, for example, using an ohmmeter which passes current through the circuit from its internal battery -a deflection (analogue meter) or a '000' reading (digital meter) indicates that there is continuity. A continuity test MUST NOT be performed on an energised circuit, as this will likely damage the ohmmeter and present a shock hazard to the user.

You would need to put an amp-meter on the circuit to see what the current draw is like. ====== If the compressor is shorted to ground you cannot check the amp draw because it will constantly kill the circuit breaker. A better way to go would be to check the continuity of the compressor to ground and each winding.

The scale of each meter manufacturer will be different. You'll need to refer to the owners manual to determine the proper setting. Remember that an ammeter is used INLINE with the electrical device to determine current draw. Do NOT put the test leads of an ammeter across the two leads of the service voltage.

A multimeter is used to test an electrical current. The meter is turned to "zero" to begin. The black wire is on a piece of metal to ground it. The red wire then is used to touch the wire in question. If the meter needle moves, there is a current and the meter will show how much current in volts. Multimeters bought in hardware stores should not be used to check current of larger wires.

meter electrical meter VOM - stands for Volts/Ohms Meter test your bulb with an Ohm meter

you need to test it with a multi meter, set on the right settings. if you knew the voltage you could get an appropriate light bulb to suit the voltage and put that across the wire to test if there is current.

Using an AIRFLOW INDICATOR METER TOOL. Baird is one of the brands that make them.

A continuity test is performed using aids. The aids are placed across a chosen path and the flow of the current is checked.

If you have the right test equipment amps are the easiest to measure. A slip over the wire amp meter is easier to use than a clamp on amp meter. The other two values have to be measured by using test leads from the test equipment.

A current of 287 microamps, which is 0.000287 amps.

You have to get a conductive test meter.

Resistance can be test by a OHM meter.

Your question is very confusing. When you say, 'meter', what type of meter? The only safe meter you can connect to a wall outlet is a voltmeter which will measure the actual voltage across the line and neutral (as opposed to the 'nominal' value). Then you bring in the subject of 'Ohm's Law' without explaining what you are trying to find. You need to rephrase the question so that it is clear what you are asking.

An amp meter can be added in series with the circuit which is difficult in most circumstances of with a clamp on amp meter which is much simpler. A clamp on amp meter measures the magnetic field that surrounds the conductor and converts its strength into a current readout.

Make sure that the test meter is on the correct voltage scale. Place one lead on one of the conductors to be tested and the other lead on the other voltage source conductor. The reading you obtain will be the voltage potential between the two conductors.

case-insensitive match using the current locale and character-set

by using phenolphthalein,litmus paper (red and blue),cabbage,tea,and PH paper or PH meter

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